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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d947d5330fcce7fb1f4b9706f40be0cda0d293cc19f6eb556062ba83da0c1b6' 
  AND token = 'Rz5giNdF9/LC6gPtS+Myc1782phfYkobyCC3TMHEKPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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