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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63719830d03626ce21b14d681d39ab10460916d66d1ba316b54e63e61df66b52' 
  AND token = 'zxAtVuZyAOu1W82PvwMYQNUOOldJxiLMmD+0qMMhwE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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