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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fea4de5345f1172306b757016b3d8cbf5989c70c3ccc8281e2fc928cdbe58ee' 
  AND token = 'mKVrrb8s2mnzM2buJgffJ/h87jTxeTZCkP9wRuzZ2JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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