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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2109366d44ec127b76d1a097dc19a8f29587ed6772791a81a44294ad1d3bdb' 
  AND token = 'UmEh6lwNtPgoI5cFh03x/wEtbB5yU0AZnR3EwPOa41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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