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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01defb03fb34c73476b0b401c66c85210852ccd9e8b30f7effe117c10620439d' 
  AND token = 'cijjAwZZcu71pAog1RWFZk54kmgfHYL/Puj0Edw63Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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