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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a795f6f20a9ce9cb9cf3564dffc8a6cc814cf5fb8f1e65587edc9a51bc3e01' 
  AND token = 'FLPqOlK4qSlnC8DVCI1kLqlTQOmxsa/8/dxsiv/BQDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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