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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c8b59748bbddbfc245ff0b4b56e47622cdde33a5b3c37048757379fc735c39' 
  AND token = 'HvruZJ8C1foegDlX/cH6/J4gc4tMCRXR/kk8Sr3PiL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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