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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2adb1fb07a18e93fa4e2ed8ede8641a3721e8f5be1bfda0e8c754676fcfb92' 
  AND token = 'bewuv+ZgGwEhlr261hotHygdSO7Po3ZWrpYG+P3SyNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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