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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f0ac87c4d206f2a5ededfebccc4511c1249553ef61b93ae43f5eecbd56eebd' 
  AND token = '7J9hu2dW9FnwPIHNy/Pzis/XxLMMxwuWdPi6ZdoLY2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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