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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd208001e94375262c6894e046ecf0a13da832437897f3b38ae3ca256ff6250f' 
  AND token = '1QRJejAvZSYBqINXplur/64XS/s1aHrk4LpCfiU43C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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