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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e296285cf5e7a688a510c4c844a5b4c2b8e7f1b4c198b5204b1ae4a3bf38c6' 
  AND token = '1okPNxU6Qc6LP2mix2lNTpLurCxIUbWkqNEcybEqINg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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