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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689cd7794e26b0ca5e57369a6febe7d5496e1b665db69c5de6526a5f0550bd67' 
  AND token = 'E4Go7B5InStrP7x1t/fVdP2pHqy0m9hjYvIGIzE6rpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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