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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666a0d2452e3dd0fddc900144da3cfe4522bdbbcb933e336fd09e51eda9490c1' 
  AND token = '3cla5wsLD4hcOJmHXLCxYEkRy/o7kytxW2W4z5TDfSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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