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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f571812589eaf8e549895d92ccb8ff01ebebdf700869b284bac7319f44eea22f' 
  AND token = 'pospyhIVVpDvs9/MjE49e/uRT3Xhvq6mlJqokDwf66A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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