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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef431c27c3bb78f4b5907550134b16f1ef375cb8200fefbf81a39eaafa7a3cf4' 
  AND token = 'x0XVLzbKGg8HfLzg+96CyEaRjKuUfNccbs5/lOrYvj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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