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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a0f34661b59b703ae7c1318582db06a98c915ebce90ce13352efd73daefa37' 
  AND token = 'Spdm0wBsr+/BOHKpMJtlidGV+rTTjANi4uIlwf70YkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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