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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e4261b178b239e65395723364d8b3c9bf9752d62b19f14fcd11eb6679c7d09' 
  AND token = '3Bn+/g8gPu7/Bmw52rDdrAFsgC3nibv2KYl3ToyyepE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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