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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5269a4f96317d2a93495692250c5b7d474ce783a8b51b5299db5088e2975e' 
  AND token = '356BUeSxEb2BtKxHRqh0cNKXiurmBwqgXegI+sT4kWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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