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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588dbad8b4016b88f966b56cacc0491b2c47f62b88490e3dadf8dd7e016e4d95' 
  AND token = 'XD3WaSKzO/kcBvxQ+0oA3Vr/eheQgGSAD9SZq1X8RNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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