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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcf9a3b2b1a95ce4ebd1c27c9a341ef7b82b6f24d2490178ff261a5fddbff88' 
  AND token = '9rSkzzI9E4gxguAKR2904mkm7rXYnkqn9q3pRhUkI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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