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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513fb8a5be5d57b23b1f96cafa4398e76c562a09eb37b2c8254a973f6d18f818' 
  AND token = 'HFBizED6U6jnVTi7o0Zoq70+tFeS0MZqA4OLKuKrLlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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