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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c5879645eedb17fee0ad0fcba833f6352ed2eed54995ff47e2a8c308ff89e0' 
  AND token = '9pLiR8xxmN+utc06LPx1T+2q1J/kxqbZ1mJCEAblSUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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