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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f384dc237ec3ae9aa20165621c606e43120afe3a5c4526c144b28a49daaf829' 
  AND token = 'WkYq+UZXk1c7z5joy4BTN7x5wna3aqTb18zn4vt2t78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}