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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754bd966f911806dfc118c9e3262f8ca93d8c80129cc79b8ed0eaf7a3c703625' 
  AND token = 'R7zcUGAo1azohtdq7o4N4P5azUbEFL5W4OFBmBfaf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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