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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ca3b98cc5bae70af2a9bf44ff570ef5103550f27cab5da859e4ac8deec2f89' 
  AND token = 'LANkeYDQgulv4nKOx0rz5GcaOXSycBznNoos4j81HRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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