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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63418c93a7692eb3339802239cfa5c3e414bba6ee117e1e6d7f282ca462a44f4' 
  AND token = 'CIV4sKPUM8e0Q+eeulw1oQ6clb/x0JZMnD5P8DBFkFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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