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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e0143ee4047a2eacbd47916695cdfde755ff67517d4ba4c35dafc53b9ddc91' 
  AND token = 'IYGPSNUHJdtbIauEjxt4q9MRirGK9CM1cX9FB6B12w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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