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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec2aa67551bcf5f54cb6f207b932ddcad0d2f771afea2dd8c11e39f03749a68' 
  AND token = 'J7XMg/tQhhTlkoXSnmmaQfifcPdxfC0QbE7mK/L1oyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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