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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b388f4128ad432f1081fb977f846fd4a0ccd0baed02f10f821d2162911d83b7' 
  AND token = '/iyPFhZSuGz/w3osn5pbvehICptgj3l1Dq6a32pxWFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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