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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92714487143e2dc3b91c2fda6f017883445c6c8336d1d002ab1be7bed8714a4' 
  AND token = 'bWlXvvWAPr/czUGyx2t+7bF75wAMbOVsgjfUAH/8H0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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