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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae050a617f6037d0bf5cac470bcd228fc4e03488b45a699547004fce3be7936b' 
  AND token = 'Xn1z9H/H6XU7PtviZY6P2vvIUcDtPVJCXkIl5/kONQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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