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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20187af1df3972eee8f8c5233621352d61328a6ba009c25ccd7d86f9cbb930a9' 
  AND token = 'P31CfLUGsq+cTw+3Mhz5g3ZF82f9hZJQrMHrwynR1xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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