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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a74536e628f98a9c3fb293eb3d38efad258dba29677568f7768ab8dfbf43a4' 
  AND token = 'X7s171S6AAg4UFT3e08e4SL9J+o50d7LQlbzxhj7DeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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