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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfdf9c97c03f8061113cbf8fc53f2cb6ee60707e3d07c7c7362e956ec881d62' 
  AND token = 'ecyKiZDZF9Qa8qcPnXbJ0B9Q6pasIkdkFGcVQ8yN7zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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