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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b4df8bd322226891f3a70068dd633d4ca31e70f80f1a42ee557804d8a2c62b' 
  AND token = '0tBAR3CV+MLiwcZU4dBGjq1mooOc/Tmm5+okN0+jmb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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