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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b251ac23debf2b996f484e45b9681632f8410063a9a4501240397c6edc4e8ba' 
  AND token = 'vAAdk6q3lyzHMStTU1NPFmBGMsXOyti8NC7HW5gcqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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