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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380844872492d16b891f56f74a1fa021d5a975d3c0aff24878ffdc7d1e081362' 
  AND token = 'ayUvyFbfNNHcLMODC51WREpcmqS8/P2gtACYepTojQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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