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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6eda9ae6e8c15d72f9628930771b78e1af86bcb8988dd7c19b778aaccaf54c' 
  AND token = 'bjnOdUONyhb0yzqrOHDXvYG0v+jRdiZ2jKzUgD915AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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