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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7457055aeb2f3e94797e8cfd1b59d361224d94de394e0c8d4c63f52291a7d2da' 
  AND token = '/wZ/8qD3918f/oHhbQK+HQJoncPUO0dF13DDcps4c+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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