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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e2ac780bb7395095e1f574d50d4f86cd43b9c9135cffdb701ec5b6638d98fa' 
  AND token = 'kFaDnyjk/Rj/6vvvsMbdiAzCC/IsD/Oi12LHo8Xnfng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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