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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56306edbdfce84729728dadadf97a84fa2dd7b330a633963211e58f06f81c17b' 
  AND token = 'Re8bFY5Tvp872+QHDVHl/rUTIF5VfpkRzqFz+68J1wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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