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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df9b9dafcb0d24e5d77c642951f0e36e4bf9f756687b82cb1c938d4dcc94a04' 
  AND token = 'BiCXd2TOylUEzmDNGMBg9n4sAQNk1BrHT0Lkivp3768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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