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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d481ad666f8b49358151a76fa4427578d7de4e0163110a36b48ac81d64b4719' 
  AND token = 'Oc8g4S7vTl0IGtLsS0wsareoeKoBuqxTPHeo71E+dC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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