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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65193108be810a59cf04d22c9968dbbf7f2beb2c771488d8aa4430b46d2d773d' 
  AND token = 'adLsaF22Vue4spnvW22Ev2GBd5PmLEmodoXHLAJ7hzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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