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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30732c2fc5906b849a58a526f1f2a5eee3a5d01c49948c61e49118b1c70d94b1' 
  AND token = '/C8r2Lms8Nd9ntL6Cn5a8fj5C3CmXKFETOSUsrxvOBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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