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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5e242a6ef64576121993c09f8cdf9dea823c1442ffd6dbeeca4edb14e5128c' 
  AND token = 'Pla85gsPdyAYUcASP7ETj13w4EaV5sPx/RJ7T46NRz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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