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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1b128e61fc1f420092a9809513cba413bf36d0afe0338566cf91560f1d40c6' 
  AND token = 'z7yWZAb7k/ZTHgxY3iUgb/jr+ZD508jx4u/uICpBt94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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