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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f2da869da945ae46a41988cbb3b3dddf30b3699f73a1d6ed25bfafb02eea60' 
  AND token = 'ayLwj7KdO9tYEP5XR/Rd6P+mySF5qjIAerdbF2O6bvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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