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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3bcada58681b5c72833739d5927e59162e87b861e03c058ea9a2ea739fe4d6' 
  AND token = 'R8Slw19v4jg0X4k5wmnFcDuo0nZbvKmnF3xcOmZEn2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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