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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2124736fb0a9abbcfc8eceb8829a3ac3fb042eaa2c1f5364287bb34e3579c68e' 
  AND token = 'YUIGxIZVzJEPqLt9EaXBLmi6TSwHlalt1XTjg8M1uOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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