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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8b811a397f78b94475d545a065cba995e2e9138c9ef8431f9d1b907bb14db5' 
  AND token = 'VxaznLGSI8AwPZj91EM839W/3bKiPISB4B3hRHGd7l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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